Pyrolysis gas combustion device and biomass combustion system

Abstract

The application provides a pyrolysis gas combustion device and a biomass combustion system. The pyrolysis gas combustion device comprises a combustion furnace, wherein the combustion furnace is provided with a combustion cavity; a flue gas outlet pipeline, wherein the flue gas outlet pipeline is communicated with the combustion cavity; a slag discharge cylinder, wherein the slag discharge cylinder is provided with a slag discharge cavity and a slag discharge port communicated with the slag discharge cavity, the slag discharge cavity is communicated with the combustion cavity; and a combustion assembly, wherein the combustion assembly comprises a mixing cylinder, an air pipeline, a gas pipeline and a first burner, the mixing cylinder is provided with a mixing cavity, the mixing cavity is communicated with the combustion cavity, the volume of the combustion cavity is greater than the volume of the mixing cavity, the air pipeline is communicated with the mixing cavity so as to supply oxygen into the mixing cavity, the gas pipeline is communicated with the mixing cavity so as to introduce pyrolysis gas into the mixing cavity, and the first burner is provided with a first flame spout, the first flame spout extends into the mixing cavity. Therefore, the pyrolysis gas combustion device has the advantages of facilitating the oxidation combustion of pyrolysis gas and low cost.

Description

Technical Field

[0001] This invention relates to the field of pyrolysis gas combustion technology, specifically to a pyrolysis gas combustion device and a biomass combustion system. Background Technology

[0002] High-temperature biomass pyrolysis gas contains large amounts of tar, high-carbon alkane gases, and dust particles. How to effectively utilize this gas is a critical bottleneck that urgently needs to be addressed. Among related technologies, a process route is adopted that first sprays and condenses to remove tar before combustion. This process route is complex, has high operating costs, and low heat utilization efficiency. Furthermore, it generates tar-containing wastewater that pollutes the environment, while the heat carried by the high-temperature biomass pyrolysis gas itself and the heat from the tar are not effectively utilized. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of the present invention provide a pyrolysis gas combustion apparatus and a biomass combustion system.

[0004] The pyrolysis gas combustion apparatus of this invention includes:

[0005] A combustion furnace having a combustion chamber;

[0006] A flue gas outlet pipe, wherein the flue gas outlet pipe is connected to the combustion chamber;

[0007] A slag discharge cylinder, the slag discharge cylinder having a slag discharge chamber and a slag discharge port communicating with the slag discharge chamber, the slag discharge chamber being connected to the combustion chamber;

[0008] A combustion assembly includes a mixing cylinder, an air line, a gas line, and a first burner. The mixing cylinder has a mixing chamber that communicates with the combustion chamber. The volume of the combustion chamber is larger than the volume of the mixing chamber. The air line communicates with the mixing chamber to supply oxygen to the mixing chamber. The gas line communicates with the mixing chamber to introduce pyrolysis gas into the mixing chamber. The first burner has a first nozzle that extends into the mixing chamber.

[0009] Therefore, the pyrolysis gas combustion apparatus according to embodiments of the present invention has the advantages of facilitating the oxidation and combustion of pyrolysis gas and having low cost.

[0010] In some embodiments, the combustion chamber is a cylindrical cavity extending in the vertical direction;

[0011] The slag discharge cylinder is located at the bottom of the combustion furnace, the slag discharge chamber is connected to the bottom of the combustion chamber, and the slag discharge port is located at the bottom of the slag discharge cylinder;

[0012] The mixing chamber extends in the same direction as the combustion chamber radially, or the mixing chamber extends in a direction tangential to the combustion chamber.

[0013] In some embodiments, the horizontal cross-sectional area of ​​the slag discharge chamber decreases radially downwards;

[0014] The combustion furnace is equipped with a first temperature detector and a first pressure detector. The first temperature detector is used to detect the temperature inside the combustion chamber, and the first pressure detector is used to detect the gas pressure inside the combustion chamber.

[0015] The flue gas outlet pipe is equipped with an oxygen content detector, a flow rate detector, a second temperature detector, and a second pressure detector. The oxygen content detector is used to detect the oxygen content in the flue gas outlet pipe, the second temperature detector is used to detect the temperature in the flue gas outlet pipe, and the second pressure detector is used to detect the gas pressure in the flue gas outlet pipe.

[0016] The flue gas outlet pipe is located at the top of the combustion furnace and extends in the vertical direction.

[0017] Alternatively, the flue gas outlet pipe is located on the periphery of the combustion furnace and adjacent to the top of the combustion furnace, and the extension direction of the flue gas outlet pipe is tangent to the combustion chamber.

[0018] In some embodiments, there are multiple combustion components, and the multiple combustion components are spaced apart in the vertical direction and / or spaced apart in the circumferential direction;

[0019] There are multiple first temperature detectors and multiple first pressure detectors, with the multiple first temperature detectors and the multiple first pressure detectors arranged at intervals along the vertical direction.

[0020] The air duct is provided with a first control valve and a first controller. The first controller is connected to the first control valve so that the first controller can control the first control valve to change the flow cross section of the air duct. The first controller is electrically connected to the oxygen content detector.

[0021] The pyrolysis gas combustion device of this invention includes a slag discharge device, which includes a slag discharge component, a driver, a second controller, and at least one level detector. The slag discharge component is movably disposed in the slag discharge chamber so that ash and slag can be discharged from the slag discharge port. The level detector is used to detect the amount of ash and slag in the slag discharge chamber. The second controller is electrically connected to the level detector and the driver. The driver is connected to the slag discharge component and can drive the slag discharge component to move. The detection data of the level detector can be sent to the second controller so that the second controller can control the start and stop of the driver.

[0022] In some embodiments, the bottom of the slag discharge cylinder is provided with a slag discharge pipe, which is connected to the slag discharge port. The slag discharge pipe is provided with a first slag discharge valve and a second slag discharge valve spaced apart in its extending direction. Both the first slag discharge valve and the second slag discharge valve can control the opening and closing of the slag discharge pipe, and at least one of the first slag discharge valve and the second slag discharge valve is in a closed state.

[0023] In some embodiments, the mixing cylinder is provided with a first flame detector, a plurality of second flame detectors and a plurality of first burners. The first flame detector extends into the mixing chamber, and the plurality of second flame detectors are used to detect the ignition status of the plurality of first burners. The plurality of second flame detectors correspond one-to-one with the plurality of first burners so that at least one of the plurality of first burners is in the ignition state.

[0024] In some embodiments, the projected area of ​​the mixing chamber is smaller than the projected area of ​​the combustion chamber in a cross-section perpendicular to the extending direction of the mixing chamber.

[0025] The mixing cavity is a cylindrical cavity.

[0026] In some embodiments, the combustion assembly further includes at least one second burner and at least one third flame detector, the second burner being disposed on the combustion furnace and having a second flame nozzle communicating with the combustion chamber, and the third flame detector being disposed on the combustion furnace and adjacent to the second burner.

[0027] The present invention also proposes a biomass combustion system, including

[0028] A biomass pyrolysis furnace, wherein the biomass pyrolysis furnace has a pyrolysis gas outlet;

[0029] A dust removal device, wherein the dust removal device has a dust removal inlet and a dust removal outlet, and the dust removal inlet is connected to the pyrolysis gas outlet;

[0030] A pyrolysis gas combustion device, wherein the pyrolysis gas combustion device is the pyrolysis gas combustion device described above, and the inlet of the gas pipeline of the pyrolysis gas combustion device is connected to the dust removal outlet. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a pyrolysis gas combustion device according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of a first burner according to an embodiment of the present invention.

[0033] Figure label:

[0034] 100 pyrolysis gas combustion device;

[0035] Combustion furnace 1, combustion chamber 11, first temperature detector 12, first pressure detector 13;

[0036] Flue gas outlet pipe 2, oxygen content detector 21, second temperature detector 22, second pressure detector 23, flow detector 24;

[0037] Slag discharge cylinder 3, slag discharge chamber 31, slag discharge pipe 32, first slag discharge valve 33, second slag discharge valve 34;

[0038] Mixing cylinder 4, mixing chamber 41, first flame detector 42;

[0039] Air line 5, first control valve 51;

[0040] Gas pipeline 6;

[0041] First burner 7, first flame nozzle 71, second flame detector 72;

[0042] Slag discharge component 81, driver 82, material level detector 83;

[0043] Second burner 9, second flame nozzle 91, third flame detector 92. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0045] The pyrolysis gas combustion apparatus 100 of an embodiment of the present invention will now be described with reference to the accompanying drawings. Figure 1 and Figure 2 As shown, the pyrolysis gas combustion device 100 according to an embodiment of the present invention includes a combustion furnace 1, a flue gas outlet pipe 2, a slag discharge cylinder 3, and a combustion assembly.

[0046] The combustion furnace 1 has a combustion chamber 11. The flue gas outlet pipe 2 is connected to the combustion chamber 11. The ash discharge cylinder 3 has an ash discharge chamber 31 and an ash discharge port connected to the ash discharge chamber 31, and the ash discharge chamber 31 is connected to the combustion chamber 11.

[0047] The combustion assembly includes a mixing cylinder 4, an air line 5, a gas line 6, and a first burner 7. The mixing cylinder 4 has a mixing chamber 41, which is connected to a combustion chamber 11. The volume of the combustion chamber 11 is larger than the volume of the mixing chamber 41. The air line 5 is connected to the mixing chamber 41 to supply oxygen into the mixing chamber 41. The gas line 6 is connected to the mixing chamber 41 to introduce pyrolysis gas into the mixing chamber 41. The first burner 7 has a first nozzle 71 that extends into the mixing chamber 41.

[0048] According to an embodiment of the present invention, the air pipeline 5 of the pyrolysis gas combustion device 100 is connected to the mixing chamber 41 to supply oxygen to the mixing chamber 41, and the gas pipeline 6 is connected to the mixing chamber 41 to introduce pyrolysis gas into the mixing chamber 41. This allows the pyrolysis gas to be easily mixed with air in the mixing chamber 41, and the first nozzle 71 of the first burner 7 is in the mixing chamber 41, so that the first nozzle 71 can ignite into the mixing chamber 41. This allows the pyrolysis gas to undergo oxidation and combustion in the mixing chamber 41 under the condition of continuous ignition of the first nozzle 71. That is, the mixing chamber 41 provides a mixing space for high-temperature pyrolysis gas and air, and also provides a partial combustion space for the pyrolysis gas. The mixing chamber 41 is connected to the combustion chamber 11, allowing the pyrolysis gas to continuously undergo oxidative combustion within the combustion chamber 11. The volume of the combustion chamber 11 is larger than that of the mixing chamber 41, facilitating thorough oxidative combustion of the pyrolysis gas within the combustion chamber 11. Furthermore, the flow rate can be varied to allow dust or ash to enter the slag discharge chamber 31. The flue gas generated from the oxidative combustion of the pyrolysis gas is discharged from the flue gas outlet pipe 2, and the ash generated from the oxidative combustion of the pyrolysis gas enters the slag discharge chamber 31 and is then discharged from the slag discharge port. Moreover, the pyrolysis gas combustion device 100 according to this embodiment has a simple process and low operating and maintenance costs, thereby reducing production costs.

[0049] Therefore, the pyrolysis gas combustion apparatus 100 according to the embodiments of the present invention has the advantages of facilitating the oxidation and combustion of pyrolysis gas and having low cost.

[0050] like Figure 1 and Figure 2 As shown, the pyrolysis gas combustion device 100 according to an embodiment of the present invention includes a combustion furnace 1, a flue gas outlet pipe 2, a slag discharge cylinder 3, and a combustion assembly.

[0051] The combustion furnace 1 has a combustion chamber 11. The combustion chamber 11 is a cylindrical cavity extending in the vertical direction, which allows the flue gas generated by oxidation combustion to swirl and exit the dust. The vertical direction is shown by the arrow in the figure.

[0052] The combustion furnace 1 is equipped with a first temperature detector 12 and a first pressure detector 13. The first temperature detector 12 is used to detect the temperature inside the combustion chamber 11, and the first pressure detector 13 is used to detect the gas pressure inside the combustion chamber 11. Specifically, there are multiple first temperature detectors 12 and multiple first pressure detectors 13. The multiple first temperature detectors 12 are arranged at intervals in the vertical direction, so that the multiple first temperature detectors 12 can detect the temperature at different positions in the vertical direction inside the combustion chamber 11; the multiple first pressure detectors 13 are arranged at intervals in the vertical direction, so that the multiple first pressure detectors 13 can detect the gas pressure at different positions in the vertical direction inside the combustion chamber 11.

[0053] like Figure 1As shown, the combustion assembly includes a mixing cylinder 4, an air line 5, a gas line 6, and a first burner 7.

[0054] The mixing cylinder 4 has a mixing chamber 41, which is connected to the combustion chamber 11. The volume of the combustion chamber 11 is larger than the volume of the mixing chamber 41. Specifically, the mixing chamber 41 is a cylindrical cavity. In a cross-section perpendicular to the extension direction of the mixing chamber 41, the projected area of ​​the mixing chamber 41 is smaller than the projected area of ​​the combustion chamber 11. That is to say, the mixed gas, including the pyrolysis gas, is in a diffusion state from the mixing chamber 41 to the combustion chamber 11, which ensures that the high-temperature pyrolysis gas can be fully oxidized and burned, and the dust carried or the ash produced by the combustion of dust can be discharged into the ash discharge chamber 31. During the diffusion process, the rapid change of airflow facilitates the discharge of dust or ash into the ash discharge chamber 31, and has a certain entrainment effect on the high-temperature flue gas, ensuring that the heavy tar and polycarbonate alkanes in the high-temperature pyrolysis gas can be fully burned.

[0055] like Figure 1 As shown, in some embodiments, the mixing chamber 41 extends in the same radial direction as the combustion chamber 11, thereby facilitating the introduction of the mixed gas including pyrolysis gas into the combustion chamber 11. For example, the mixing chamber 41 extends in a left-right direction, as indicated by the arrows in the figure.

[0056] In some embodiments, the extending direction of the mixing chamber 41 is tangent to the combustion chamber 11, thereby allowing the mixed gas introduced into the combustion chamber 11 to swirl, which facilitates the swirling dust discharge.

[0057] like Figure 1 As shown, air line 5 is connected to mixing chamber 41 to supply oxygen to mixing chamber 41. Gas line 6 is connected to mixing chamber 41 to introduce pyrolysis gas into mixing chamber 41. That is, air enters the mixing chamber from air line 5, and high-temperature pyrolysis gas enters the mixing chamber 41 from gas line 6, thereby facilitating the mixing of high-temperature pyrolysis gas and air.

[0058] The first burner 7 has a first flame nozzle 71 that extends into the mixing chamber 41. Specifically, the first burner 7 includes a first sub-gas line and a first sub-ignition air line, which are connected to the first flame nozzle 71 to enable continuous ignition. The first flame nozzle 71 faces the combustion chamber 11, and the first burner 7 is a continuously ignited pilot flame burner. For example, the first flame nozzle 71 faces to the right.

[0059] like Figure 1 and Figure 2 As shown, in some embodiments, the mixing cylinder 4 is provided with a first flame detector 42, a plurality of second flame detectors 72 and a plurality of first burners 7.

[0060] The first flame detector 42 extends into the mixing chamber 41 and is used to monitor whether the biomass high-temperature pyrolysis gas is ignited.

[0061] Multiple second flame detectors 72 extend into the mixing chamber 41. These detectors detect the ignition status of multiple first burners 7, with each detector corresponding to one of the first burners 7 so that at least one of the first burners 7 is in an ignition state. Specifically, the multiple second flame detectors 72 monitor the ignition status of the multiple first burners 7 in a one-to-one correspondence. The detectors 72 are electrically connected to each other, so that when one of the first burners 7 is detected to be extinguished, at least one of the remaining first burners 7 will ignite. For example, the mixing cylinder 4 may have two second flame detectors 72 and two first burners 7.

[0062] like Figure 1 As shown, the combustion assembly also includes at least one second burner 9 and at least one third flame detector 92. The second burner 9 is mounted on the combustion furnace 1 and has a second flame nozzle 91 communicating with the combustion chamber 11. The third flame detector 92 is mounted on the combustion furnace 1 and is adjacent to the (corresponding) second burner 9. Specifically, the second burner 9 has a second sub-gas pipeline and a second sub-ignition air pipeline communicating with the second flame nozzle 91. The second burner 9 serves as a backup burner for the first burner 7. When the pyrolysis gas combustion device 100 needs to be shut down or its load reduced for any reason, the second burner 9 can be gradually put into use to ensure that the subsequent waste heat boiler of the pyrolysis gas combustion device 100 can normally and slowly reduce its load. The third flame detector 92 can detect the ignition status of its corresponding second burner 9. For example, there are multiple second burners 9 arranged at intervals in the vertical direction. The second burner 9 and the third flame detector 92 extend into the combustion chamber 11.

[0063] like Figure 1 As shown, the flue gas outlet pipe 2 is connected to the combustion chamber 11, and the flue gas produced by the oxidation and combustion of pyrolysis gas can be discharged from the flue gas outlet pipe 2. The flue gas outlet pipe 2 can be connected to a waste heat boiler to utilize the waste heat of the flue gas.

[0064] The flue gas outlet pipe 2 is equipped with an oxygen content detector 21, a flow rate detector 24, a second temperature detector 22, and a second pressure detector 23. The oxygen content detector 21 is used to detect the oxygen content in the flue gas outlet pipe 2, the second temperature detector 22 is used to detect the temperature in the flue gas outlet pipe 2, and the second pressure detector 23 is used to detect the gas pressure in the flue gas outlet pipe 2. Thus, the flow rate, oxygen content, temperature, and pressure of the flue gas can be detected, thereby determining the combustion status of the pyrolysis gas and adjusting the temperature, flow rate, oxygen content, and pressure of the flue gas in the flue gas outlet pipe 2. Specifically, the second pressure detector 23 is electrically connected to the subsequent flue gas fan, which can adjust the gas pressure in the flue gas outlet pipe 2 (making the gas pressure in the flue gas outlet pipe 2 negative); by adjusting the oxygen supplied to the mixing chamber 41 through the air pipe 5, the oxidation and combustion of the pyrolysis gas can be adjusted, thereby regulating the oxygen content in the flue gas outlet pipe 2.

[0065] In some embodiments, the flue gas outlet pipe 2 is located at the top of the combustion furnace 1 and extends in the vertical direction, so as to facilitate the discharge of flue gas from the flue gas outlet pipe 2 after it rises.

[0066] In some embodiments, the flue gas outlet pipe 2 is located around the combustion furnace 1 and adjacent to the top of the combustion furnace 1, and the extension direction of the flue gas outlet pipe 2 is tangent to the combustion chamber 11, thereby facilitating the swirling discharge of flue gas from the combustion chamber 11.

[0067] In some embodiments, the air duct 5 is provided with a first control valve 51 and a first controller. The first controller is connected to the first control valve 51 so that it can control the first control valve 51 to change the flow cross-section of the air duct 5. The first controller is electrically connected to the oxygen content detector 21. Specifically, increasing the flow cross-section of the air duct 5 increases the amount of oxygen entering the mixing chamber 41 and the combustion chamber 11. When the oxygen content detector 21 detects a low oxygen content in the flue gas outlet duct 2, it can send this information to the first controller, so that the first controller can control the first control valve 51, thereby increasing the flow cross-section of the air duct 5. For example, the first control valve 51 is a solenoid valve.

[0068] In some embodiments, there are multiple combustion components, which are spaced apart in the vertical direction and / or in the circumferential direction, thereby increasing the efficiency of oxidative combustion of the pyrolysis gas. The multiple combustion components being spaced apart in the vertical direction and / or in the circumferential direction includes a. multiple combustion components being spaced apart in the vertical direction; b. multiple combustion components being spaced apart in the circumferential direction (combustion furnace 1); c. multiple combustion components being spaced apart in both the vertical and circumferential directions.

[0069] The slag discharge cylinder 3 has a slag discharge chamber 31 and a slag discharge port communicating with the slag discharge chamber 31. The slag discharge chamber 31 is connected to the combustion chamber 11. Specifically, the slag discharge cylinder 3 is located at the bottom of the combustion furnace 1, the slag discharge chamber 31 is connected to the bottom of the combustion chamber 11, and the slag discharge port is located at the bottom of the slag discharge cylinder 3, so that dust and ash can be discharged from the slag discharge port.

[0070] In some embodiments, the horizontal cross-sectional area of ​​the slag discharge chamber 31 decreases radially downward, thereby facilitating the downward discharge of dust and ash. For example, the slag discharge chamber 31 is a conical cavity with an inner radial decrease.

[0071] In some embodiments of the present invention, the pyrolysis gas combustion device 100 includes a slag discharge device, which includes a slag discharge component 81, a driver 82, a second controller, and at least one material level detector 83.

[0072] The slag discharge component 81 is movably disposed within the slag discharge chamber 31 so that ash and slag can be discharged from the slag discharge port. Specifically, the slag discharge component 81 is a slag discharge grate, which can move or rotate in the horizontal direction so that ash and slag can be discharged from the slag discharge port.

[0073] The level detector 83 is used to detect the amount of ash and slag in the slag discharge chamber 31. The second controller is electrically connected to the level detector 83 and the driver 82. The driver 82 is connected to the slag discharge component 81 and can drive the slag discharge component 81 to move. The detection data from the level detector 83 can be sent to the second controller so that the second controller can control the start and stop of the driver 82. Specifically, the driver 82 is a motor, which can drive the slag discharge component 81 to move horizontally or rotate. The driver 82 can drive the slag discharge component 81 to move at regular intervals or irregular intervals. When the level detector 83 detects that the amount of ash and slag in the slag discharge chamber 31 is too high, it can send this information to the second controller so that the second controller can control the driver 82 to start. For example, there are multiple level detectors 83, which are spaced apart in the vertical direction.

[0074] In some embodiments, the bottom of the slag discharge cylinder 3 is provided with a slag discharge pipe 32, which communicates with the slag discharge port. The slag discharge pipe 32 is provided with a first slag discharge valve 33 and a second slag discharge valve 34 spaced apart along its extending direction. Both the first slag discharge valve 33 and the second slag discharge valve 34 can control the opening and closing of the slag discharge pipe 32, and at least one of the first slag discharge valve 33 and the second slag discharge valve 34 is in a closed state. That is, both the first slag discharge valve 33 and the second slag discharge valve 34 are in a closed state, or one of the first slag discharge valve 33 and the second slag discharge valve 34 is in a closed state, thereby preventing external gas from entering the combustion chamber 11. Specifically, the slag discharge cylinder 3 extends vertically, and the first slag discharge valve 33 is located above the second slag discharge valve 34. When slag discharge is required, the first slag discharge valve 33 opens first, and the second slag discharge valve 34 is closed at this time. Then, the first slag discharge valve 33 is closed, and the second slag discharge valve 34 is opened, so that ash and slag can be discharged from the slag discharge cylinder 3.

[0075] In some embodiments, at least one third control valve is provided on the slag discharge pipe 32. At least one of the third control valve, the first slag discharge valve 33, and the second slag discharge valve 34 is in a closed state.

[0076] The present invention also proposes a biomass combustion system, which, according to an embodiment of the present invention, includes a biomass pyrolysis furnace, a dust removal device, and a pyrolysis gas combustion device.

[0077] The biomass pyrolysis furnace has a pyrolysis gas outlet, from which the pyrolysis gas produced by the furnace can be discharged. The dust removal device has a dust removal inlet and a dust removal outlet; the dust removal inlet is connected to the pyrolysis gas outlet, and the dust removal device removes a portion of the dust from the pyrolysis gas. The pyrolysis gas combustion device is a pyrolysis gas combustion device 100 according to an embodiment of the present invention. The inlet of the gas pipeline 6 of the pyrolysis gas combustion device is connected to the dust removal outlet, so that the pyrolysis gas can be burned in the pyrolysis gas combustion device. The flue gas outlet pipe 2 of the pyrolysis gas combustion device 100 is connected to a waste heat boiler. Thus, the dust-laden high-temperature (around 500°C) pyrolysis gas, after preliminary dust removal (filtration) by the dust removal device, is oxidized and burned within the pyrolysis gas combustion device 100. The high-temperature flue gas (950°C-1300°C) generated by combustion enters the subsequent waste heat boiler recovery system. For example, the dust removal device is a high-temperature cyclone dust collector.

[0078] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0079] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0080] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0082] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A pyrolysis gas combustion device, characterized in that, include: A combustion furnace having a combustion chamber; A flue gas outlet pipe, wherein the flue gas outlet pipe is connected to the combustion chamber; A slag discharge cylinder, the slag discharge cylinder having a slag discharge chamber and a slag discharge port communicating with the slag discharge chamber, the slag discharge chamber being connected to the combustion chamber; A combustion assembly includes a mixing cylinder, an air line, a gas line, and a first burner. The mixing cylinder has a mixing chamber that communicates with the combustion chamber. The volume of the combustion chamber is larger than the volume of the mixing chamber. The air line communicates with the mixing chamber to supply oxygen to the mixing chamber. The gas line communicates with the mixing chamber to introduce pyrolysis gas into the mixing chamber. The first burner has a first nozzle that extends into the mixing chamber.

2. The pyrolysis gas combustion apparatus according to claim 1, characterized in that, The combustion chamber is a cylindrical cavity extending in the vertical direction; The slag discharge cylinder is located at the bottom of the combustion furnace, the slag discharge chamber is connected to the bottom of the combustion chamber, and the slag discharge port is located at the bottom of the slag discharge cylinder; The mixing chamber extends in the same direction as the combustion chamber radially, or the mixing chamber extends in the same direction as the combustion chamber.

3. The pyrolysis gas combustion apparatus according to claim 2, characterized in that, The horizontal cross-sectional area of ​​the slag discharge chamber decreases radially downwards; The combustion furnace is equipped with a first temperature detector and a first pressure detector. The first temperature detector is used to detect the temperature inside the combustion chamber, and the first pressure detector is used to detect the gas pressure inside the combustion chamber. The flue gas outlet pipe is equipped with an oxygen content detector, a flow rate detector, a second temperature detector, and a second pressure detector. The oxygen content detector is used to detect the oxygen content in the flue gas outlet pipe, the second temperature detector is used to detect the temperature in the flue gas outlet pipe, and the second pressure detector is used to detect the gas pressure in the flue gas outlet pipe. The flue gas outlet pipe is located at the top of the combustion furnace and extends in the vertical direction. Alternatively, the flue gas outlet pipe is located on the periphery of the combustion furnace and adjacent to the top of the combustion furnace, and the extension direction of the flue gas outlet pipe is tangent to the combustion chamber.

4. The pyrolysis gas combustion apparatus according to claim 3, characterized in that, The combustion components are multiple, and the multiple combustion components are spaced apart along the vertical direction and / or spaced apart along the circumferential direction; There are multiple first temperature detectors and multiple first pressure detectors, with the multiple first temperature detectors and the multiple first pressure detectors arranged at intervals along the vertical direction. The air pipeline is equipped with a first control valve and a first controller. The first controller is connected to the first control valve so that the first controller can control the first control valve to change the flow cross section of the air pipeline. The first controller is electrically connected to the oxygen content detector.

5. The pyrolysis gas combustion apparatus according to claim 2, characterized in that, The device includes a slag discharge unit, a driver, a second controller, and at least one level detector. The slag discharge unit is movably disposed within the slag discharge chamber to allow ash and slag to be discharged from the discharge port. The level detector is used to detect the amount of ash and slag in the slag discharge chamber. The second controller is electrically connected to the level detector and the driver. The driver is connected to the slag discharge unit and can drive the slag discharge unit to move. The detection data from the level detector can be sent to the second controller so that the second controller can control the start and stop of the driver.

6. The pyrolysis gas combustion apparatus according to claim 5, characterized in that, The bottom of the slag discharge cylinder is provided with a slag discharge pipe, which is connected to the slag discharge port. The slag discharge pipe is provided with a first slag discharge valve and a second slag discharge valve that are spaced apart in its extending direction. Both the first slag discharge valve and the second slag discharge valve can control the opening and closing of the slag discharge pipe. At least one of the first slag discharge valve and the second slag discharge valve is in a closed state.

7. The pyrolysis gas combustion apparatus according to claim 2, characterized in that, The mixing cylinder is equipped with a first flame detector, a plurality of second flame detectors and a plurality of first burners. The first flame detector extends into the mixing chamber. The plurality of second flame detectors are used to detect the ignition status of the plurality of first burners. The plurality of second flame detectors correspond one-to-one with the plurality of first burners so that at least one of the plurality of first burners is in the ignition state.

8. The pyrolysis gas combustion apparatus according to claim 2, characterized in that, In a cross-section perpendicular to the extending direction of the mixing chamber, the projected area of ​​the mixing chamber is smaller than the projected area of ​​the combustion chamber; The mixing cavity is a cylindrical cavity.

9. The pyrolysis gas combustion apparatus according to any one of claims 1-8, characterized in that, The combustion assembly further includes at least one second burner and at least one third flame detector. The second burner is disposed on the combustion furnace and has a second flame nozzle that communicates with the combustion chamber. The third flame detector is disposed on the combustion furnace and is adjacent to the second burner.

10. A biomass combustion system, characterized in that, include A biomass pyrolysis furnace, wherein the biomass pyrolysis furnace has a pyrolysis gas outlet; A dust removal device, wherein the dust removal device has a dust removal inlet and a dust removal outlet, and the dust removal inlet is connected to the pyrolysis gas outlet; A pyrolysis gas combustion device, wherein the pyrolysis gas combustion device is the pyrolysis gas combustion device according to any one of claims 1-9, and the inlet of the gas pipeline of the pyrolysis gas combustion device is connected to the dust removal outlet.

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